Turkana and Siaya counties have posted the weakest own-source revenue (OSR) performance in the first nine months of the 2025/26 financial year, despite a national increase in county collections. This underperformance highlights significant disparities in revenue mobilization capabilities among Kenya's 47 counties.

• Turkana collected only 13.6 percent of its OSR target, while Siaya managed 19.5 percent.
• The National Treasury data indicates that inefficiencies in revenue administration, weak enforcement, and optimistic projections are contributing factors.
• Overall, counties collectively raised Sh53.83 billion, a 17.2 percent increase, representing 53.8 percent of their total target.